OneUp RADr rear derailleur cage review

Novel solution to crawler cog blues

BikeRadar score3.5/5

Adding a 42-tooth ‘crawler cog’ to your 1x10 drivetrain may make the climbs easier but it also leaves a big gap between sprockets that can cause shifting problems, or at least require painstaking set-up. Enter OneUp with the RADr cage. Designed to replace both cages on your Shimano Shadow Plus rear derailleur, it moves the top jockey wheel backwards for better shifting between the big sprockets.

It’s straightforward to fit, though you need to disassemble your derailleur – and a seized stop screw on our SLX unit meant we had to get the mole grips out. Shifting to and from the 42t sprocket is noticeably improved and seems just as slick as usual elsewhere. We can’t comment on durability yet but the 7075-T6 alloy cage has a low profile to help keep it out of the way of rocks.

Add in the cost of a OneUp 42t sprocket (US$90) and it’s still more affordable than the cheapest 1x11 option – a Shimano XTR cassette, derailleur, shifter and chain. But if you don’t need such a wide range of gears, a 40t cog offers many of the benefits with no need for a new cage.

The RADr cage ships worldwide from the US – check www.oneupcomponents.com for more info

This article was originally published in Mountain Biking UK magazine, available on Apple Newsstand and Zinio.

CW has been riding mountain bikes for more than two decades now. He's the first to admit he's not the fittest or most skilful rider on the hill, but that doesn't stop him sweating up the climbs to have a blast on the downhills.
  • Age: 38
  • Height: 189cm/6'2"
  • Weight: 70kg/154lb
  • Waist: 32in/81cm
  • Chest: 40in/102cm
  • Discipline: MTB, commuting
  • Preferred Terrain: Big mountains and flowing singletrack
  • Current Bikes: Whyte T-129 S SCR, Stanton Sherpa 853, Pinnacle Dolomite 6
  • Dream Bike: Evil The Following
  • Beer of Choice: Theakston Old Peculier
  • Location: Bristol, UK

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